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purchased over-the-counter or delivered and installed by an authorized mcintosh ... dealer mcintosh products that are purchased over the internet by phone or ... mail order are presumed to be used and do not qualify for any mcintosh ... warranty mcintosh does not warrant in any way products that are purchased from ... anyone who is not an authorized dealer or products that have had their ... serial number altered or defaced mht200 a/v system controller optional tuner ... full bandwidth amplifiers mcintosh amplifiers are rated across the full 20-20,000hz ... from clipping distortion on peaks using a patented light-beam-triggered circuit ...